package principle.facade;

/**
 * @author malguy-wang sir
 * @create ---
 */
public class projector {//投影仪
    //单例模式-饿汉式
    private static projector instance = new projector();
    public static projector getInstance() { return instance; }
    public void on(){ System.out.println("projector on"); }
    public void off(){ System.out.println("projector off"); }
    public void focus(){ System.out.println("projector pop"); }
}
